Method for producing screws, bolts, pins, or the like.



objeei e ei my invention, among ogii s? is ji @dime iiiusiee, heededzwtiefs fem 'Wlie @if Substantially the body ef the inisieci eiieeiypointed out' heise i have invented the mehoci 'flie-5 Figui'e lreggieseiie an arrangement suie able eicei'iyii'ig 0m; one seep -'A mypre feired metiied es applied 'te bolt 01' Scef emi A l 2, 3 and 5repilesent sucessive siepe ei' opera-eiche in my prefeme' method,beginning wiiti'i the ieugh benk and ending with die nisiieai boit 0i'screw.

lu e126 L iiiuegmte the prefeiieei form my im we neve edeptefi 'the mehring eigu he eligen heeded Screw' 0i beit, but it 'wiii be i ifieieeodthai; my inveiitien ie by ne me eenfmed 15e me fermaiooii of this, oi:in '1' Specific form of Screw7 beit of l i,

. Q, if have iiiustieted'e rough bienk E? Y -1 s a is ih e emile yea-iid'"e produced m a Wife heading' machine mi any Weii known type9 "'1 1 themete; is out temthe propel; (and ehem heeded meppmpiiete diM uid. eis@be pifedueed 1i: ai ey b ne im.meer;h

the Wife :from Nilieh the il ie en eneigemeiii; ef

isiie shank@ bedy' genei'eiiyeyiiiidiieei buis rough in its mit" linee@e @emes feil the die. l2 ie me enim'gemeiit ifiem which ihe head. ofthe seiewie uieimeteiy fie be cuio This eiiieigemem; may he eyiilidriceior ai ther eppi'opiiete ehepem cioss-secfalon, according,

the denk when my pi'eieireci method ie ueeii te produce e polygone-iheeded screw 0i' pi rvwe iiimik .of Fig. 2 has been @esem eiireugiiepprepriete cutting or trim- 5 devieee 1 which die `polygonel shapegiven ithe sides; the heed.. This ijf one by suitable dies. ie-Wn einethird Stege 0:3 the it) pieeiieci inebhefi is used 'i0 griseduee epeiygeiml 'heeded Seew' el pin, Here the blank has been turned. so as befinish the top and 'betteln of the head anni? when she het immeciepemion Wee peiofmeci, the cutting tool was carried inte the enlargedpuit li. of the shank to turn member Wiiieifi would 0e- 'Tube 'pziiiipei'; ei' the iinisheci screw, tile 85 'the seme te approximately thediameter of able to provide the turned portion 16 so that engage theenlarged body portion 1l of the blank, I simultaneously roll this bodyportion into a cylindrical shape of the diameter of the p lain part 23of the shank of the finished screw, thus completing the screw and alsoinsuring'that the plain and the Ithreaded portions of the screws areconcentric. Y

The slopes 21, 22, permit the body portion 11 to enter the space betweenthe platens 19, Q0 gradually. It will be understood, of course, that thespace between the platens 19,20 is equal to the diameter of the plainpart 23 of the finished shank.

While I have shown the platens as part of the threading dies, they maybe separate pieces, if desired.

I have found in practice that it is preferthe surplus metal on theenlargement l1 can flow into the same. ,But the turned portion 16 is byno means necessary, it being possible to roll the portion 1.1 withoutit.

While the method which I have described is the one which I prefer, itwill be-obvious that it may be varied within wide limits, particularlyin accordance with the various kinds of screws to be produced.

While,-as a matter of economy of time and also to insure theconcentricity oi the threaded 'and the plain portions of the screw, Iprefer to roll the plain portion and the thread at'the same time, itshould be understood that for some purposes thesev operations may becarried out successively. vVyhile for purposes of illustration I haveshown the rolling of the plain portion and of the threads as beingcarried out by the method known as platen rolling it will be obvious tothose skilled in the art, that the same may be done by any other methodof Y rolling as with rollers only or With a platen and a roller.

Vhile I have described my method in' ,connection with the production ofa polygonal headed screw it will vbe understood that my method may beused for the production of screws with any other kind of head and,indeed, may be used for screws of the headless type. Obviously, the kindof {ini-sh to be 'given the head will depend on the shape of the headand, if the screws are of the headless type, then the head finishingoperations which I have described will, of course, be omitted.

.It will also be understood that' while I have described the preferredsequence of operations in carrying out the preferred form of my method,such sequence is by no means essential. For instance, it is possible toroll and thread the screw before finishing the head. I do not wish,therefore, to be limited to the particular sequence in which the stepsare enumerated in the appended claims.

While, because of the eXtreme cheapness` of the operation I prefer toroll the threads on the screws, it will be understood that my y methodis not limited to such rolling, since this threading may be done in manydifferent ways. It the thread is to be out by 'the usual dies, then, ofcourse, the enlarged body Y portion 11 would normally not be provided,

such enlargement being provided in the form of blank which I haveillustrated, because the thread rolling operation enlarges the diameterof the body portion of the blank, and the enlargement ll is necessary tobring the plain portion of the screw to the diameter of the tops of thethreads.

I claim;

l. The method of producing iinished polygonal headed screws from blanks,comprising the forming of a head and anv enlargement of the bodyadjacent the head on a length of the blanks, by dies, the cutting of thepolygonal sides of the head, the finishing of the bottom of the head andLthe turning of a portion of the body'oi the'blank adjacent `the head tosubstantially the finished size ott the plain portion of the body of theinished screw, the Vdiameter of this turned portion beino' less thanthat of said enlargement, the simurltaneous rolling of the blanksbetween apair of platens to size and true the enlarged body portion tothe size and shape 'of the plain-portion of the body of the iinishedscrew-'and'between a pair of threading dies to thread the remainder ofthe body of the blank.`

2. The method of producing finished po lygonal headed screws fromblanks, comprising the forming of a head and an enlargement/ofl the bodyadjacent the head, on a length of the wire by dies, the forming of thepolygonal sides of the head, the finishing of the bottom of the head andforming a portion of the body of the blank adjacent the head tosubstantially the finished size of the plain portion of the body of thefinished screw, the diameter of this turned portion being less thanlthat of said enlargement, the simultaneous rolling of the blanks tosize and true the enlarged body porti-on to the size and shape or" theplain portion of the body of the finished screw and between a pair ofthreading dies to thread the remainder of the body of the blank.

3. 'Ihb method' of producing finished polygonal headed. screws fromheaded blanks lll Elli

' erelly cylindrical body and a head hear inaini' merano? haring agenerally cylindrical body, coinprising the euttif g of trie polygonalSides 'of the heedy the finishing olf bottoni of the head, the rollingoi a po tion of the/body of the blank to the eine and Shape ot the pleinpart of the finished screw and the threading oi the remaining' portionor the oody. 4

The method of producing' finished led eorewe from. blenlre, ooinprieingthe forming ot' e, head and the body adjacent the head on :i length ofthe blenlrs, by dies, the finishing et.' the head, including theturningv of o, sinell portion of the body the blank to the liniehed Sizeof the plain'portion of the body of the finished serew, Ve rollingoi?the blenlr between a pair or' platene to size and true the enlereol bodyportion to the size and Shape or' the plein portion or the body of thefinished Screw and between a pair of threading' dies to thread thereineiningportion ot thebody.

5. rihe method `-otr producing llinished headedsorews fromblanks,pcomprising the formingglof 'e heed and an enlargement of thebody adjacent the head on :t length of the blanks, bydieethe finishing'of theheadr includingl the turning of smell portion or' the'body theblank to the iniehed size oi the plein portion of the body ol.I thelinished Soremthe diameter of this turned portion being lees than thetof said enlargement, the

rolling; ol? the blank between a pair oi pla-tens to eine i-nd true theer ll gedbody portion to the eine and Shape oi"a 'the plain portion olthe body of the finished screw and between n peir threadino to threadthe re uportion n ti body, the two rolling; operations ooenrrinfgisimultan/one 6. The method producing iinielied hea-ded sorewo fromblanke having# genhereon comprising thev formino; of seid body with enenlarged portion adjacent to the head,

f lnishing the heed, the rolling or' the blank between e pair of platensto reduce the size and true the said enlarged portion 'to the Size v undshape of the plein portion 'ot the body orally oylindrieel body andbetween a pairA or .platone to reduce the size of the finished Screw andthe rolling of the remaining portion ol? the body between e pair voftl'ireading dies to thread it.

7. The niethod of pr fleeingl finished headed Screws from blanke havingo gena head thereon, Comprising; the forming olf ii'lishing the beechthe rolling oi' the blank and true the said enlarged portion to the siteand shape et the plain portion ot the body .ew and i. i lii et the reinainin r' enlargement of'v said body with en enlarged portion adiacent tothe head,

ser

cylindrical body, Comprising the finishing or. the head, the turning ofai small portion or' the body to the iniehed Size of the pla-in part ofthe liniehed screw, vthe rolling of e, portion oi body to the size :dshape oi' the plain port of the nished screw and the threading ot theremaining portion ot the body.

9. The. method of producing iinished Screws from. blenke having' egenerally oylindrieal body, Awhich ooinprises the forming oi an enlargedportion upon said body adjacent to the head, the simultaneous rollingore port i the body between a. pair or plain platone to reduce the sizeand true said enlarged portion to the size and shape of the nnthre'adedportion of the body of the finished Screw and the remainingl portion orthe body between a pair of threading dies to thread the said remainingportion.

l0. The method of producing finished :screws from blanks having agenerally eylindrioal body, 4which eomprisesthe forming of an enlargedportion upon said body adjacent to the head, the rolling of Saidenlarged portion to reduce the size and treo that part 'of thel body tothe size and shape of the unthrended portion of the body of the finishedscrew and the rolling' ol? the ineining portion of the body between e.pair of threading dies to thread the reid remaining portion. r'

11. The method of Screws from blztnlre he; lindrieal body, whip" iprisesthe forming or' an enlarged pero n upon Said body adjacent to the head,the rolling to reduce the Size and true said enlarged portion to e eineand shape or' the Unthreaded portion of the body of the iinished screwand finished t generally ey- 'Ill blank.

12. The method of producing finished headed members Such as screws, pinsor the like from rough blanks having a generally lcylindrical. body andon enlarged portion adjac to the head, comprising the iinishing of thehead end the rolling of said enlarged portion. toeize and true it 'tothe size andehztpe of the Unthreaded or plain body portion of theiinislaed member.

. 13.. The method of producing headed Screws or bolts from material ofslib etantielly uniform diameter vcomprising; the 'forming ot e headupon one end thereof and en enlargement or seid materiel adjooent tothehead, Said enlargement boing of substantially the same orslightlygreater diameter than that of the threaded portion ruiter thethreads have been rolled thereon and the rolling or the blank' betweenthread-- inof dine to thread the remainder of the body ianlr and plotoneto eine and shape 'er tion to slibstantiolly the ne olL the threadedportion.

14. The method of producing headed screws or bolts consisting in forminga blank with a head on one end, and a shank having one portion of lessdiameter than the other 5 portion, the diameter of the enlarged portionbeing substantially the same or slightly larger than the outsidediameter of the threads when rolled on the smaller portion;

' and the rolling of said smaller portion between threading dies to rolla thread thereon, and the larger portion between platens to size andshape the same to substantially the size and shape of the threadedportion.

RCHARB LESTER WILCOX.

